Abstract
Abstract A mechanism of a new quantum paraelectric state (QPS) formation in incipient ferroelectrics of SrTiO3-type and its role in spectroscopic effects are considered. The proposed model is based on the assumption that the tunnelling off-center ions appear in the host lattice in the vicinity of strong elastic defects. The corresponding order-disorder type clusters are responsible for QPS. The local transition in such clusters leads to ferroelectric microdomain formation. The corresponding new modes have an order-disorder nature (cooperative tunnelling modes) as well as displace one (a new acoustic-like microdomain mode). But in both cases the mixing of different type of modes plays an important role. This model gives the possibility to explain the main experimental results.
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